Dynamite box



Feb. 14, 1956 c. A. LAWRENCE 2,734,676

DYNAMITE BOX 5 Sheets-Sheet 1 Filed Dec. 3 1951 INVENTOR.

I g; 4d/A -AJ ATTORNEYS Feb. 14, 1956 Filed Dec. 3 1951 c. A. LAWRENCE DYNAMITE BOX 5 Sheets-Sheet 2 ya aka INVENTOR.

CHESTER A. LA WRENCE A TT ORNE Y S Feb. 14, 1956 c. A. LAWRENCE 2,734,676

DYNAMITE BOX Filed Dec. 3, 1951 5 Sheets- Sheet 5 INVENTOR.

/ CHESTER A. LAWRENCE BY \7'401- /-744//M A T TORNE Y8 Feb. 14, 1956 c. A. LAWRENCE 2,734,676

DYNAMITE BOX Filed Dec. 5, 1951 5 Sheets-Sheet 4 IN V EN TOR.

CHESTER A. LAWRENCE Feb. 14, 1956 c. A. LAWRENCE 34,

DYNAMITE BOX Filed Dec. 3, 1951 5 Sheets-Sheet 5 FIJI INVENTOR.

CHESTER A. LAWRENCE United States Patent du Pont de Nemours and Company, Wilmington, DeL, a corporation of Delaware Application December 3, 1951, Serial No. 259,559

1 Claim. (Cl. 22923) The present invention relates to a new and improved box for packing dynamite.

This application is a continuation-in-part of my copending application filed July 15, 1950, Serial No. 174,023, now abandoned.

After considering and making use of many types of boxes offered in the industry for the packing of dynamite, I have concluded that none of the boxes offered heretofore are entirely satisfactory for this purpose.

It is an object of my invention to produce a new and improved dynamite b o x of surpassing structural strength, while employing a construction which tends to minimize dangers present during loading and handling of dynamite. It is a further object of my invention to produce a box which may be readily opened or closed without injuring or destroying the utility of the box or damaging the contents. The box of the invention also will be so constructed as to be suitable for conversion and resizing so as to minimize losses at the completion of its original purpose. Another object is a box so simple in design and construction that the manufacturing steps, costs and shipping weight are also substantially reduced; a rigid type box which is not dependent upon strength built up from within by the contents.

A further object of my invention is to form reinforcing or stiffening ribs at required points by scoring two spaced parallel lines in close proximity to each other, and in folding the carton material at said scored lines to form right angle walls with an angular surface therebetween forming the rib.

A further object is to produce a carton or box by scoring and slitting and without the employment of cutting dies.

A further object is to provide a carton or box of such design as to require but two different pieces, thus simplifying the problem of storage space.

A further object is to provide a carton or box which can be easily opened without the use of metallic implements.

A further object is to provide a carton or box assembly of such design as to present a double rib reinforcement at desired points.

A further object is to provide a carton or box with double walled shoulders at certain abutting points.

A further object is to provide a carton or box with reinforcing ribs so disposed that when the cartons are stacked the weight and thrust thereon will be exerted upon the ribs and when slid upon one another, excessive friction will be eliminated.

A further object is to provide a carton or box suitable for storing an/or shipping of either explosives or fragile articles wherein multiple compartments are formed by the double scoring and folding method to form reinforcing ribs at the corners of the walls of said compartments.

A further object is to provide a carton or box suitable for storing and/or shipping of either explosives or fragile articles wherein the use of metallic fastening devices is A 2,734,676 Patented Feb. 14, 1956 confined to the sides of said cartons, leaving the surfaces normally exposed to friction free therefrom.

The box is designed for fully mechanized package operations and is intended to supplant the wooden box for both domestic and export service. Other objects will appear from the following detailed description.

My invention comprises a box made up in three sections; namely, a top, a bottom, and a tubular inner lining section. The top and bottom meet but do not overlap outside of the tubular inner liner. The top and bottom may be considered structural duplicates for the reason that they differ only in the size of their panels which go to form the walls of the box. There is no difference in the structural advantages as to strength whether the box is divided equally or unequally. The line of joinder where the top and bottom meet outside of the liner, is sealed with tape after the box is filled and ready for shipping.

The actual construction of the box may be better understood by referring to the various figures of the drawing which set forth the preferred embodiment of the invention.

Referring generally to the various figures, Figure 1 is a view of the blank used for forming the top of the box. Figure 2 is a similar view of the blank for the bottom. Figure 3 is a view of the liner. Figure 4 is a view of the top after assembling by staple stitching. Figure '5 is a similar view of the bottom assembled. Figure 6 is a view of the tubular liner assembled by staple stitching. Figure 7 is a view of the liner disposed in the bottom with the top suspended above. Figure 8 is a view of the completely assembled box taped for shipping. Figure 9 is a cross-sectional view of the top of the box showing flap 7 and side Wall 8 stapled together. Figure 9a is a similar view with the flap stapled to the inside of the side wall. Figures 10 and 11 show a view of the box in the various stages when it is desired to equip the box with two single tubular inner lining sections to effect a two-compartment box. Figure 12 is a view similar to Figure 7 but showing alternative structure. Figure 13 is a sectional view of a sheet of board suitable for the formation of my improved carton and showing the spaced scored parallel lines which are the basis for folding. Figure 14 is a view of the same material folded to form a rib which is a subject of my invention. Figure 15 is a perspective view of a box corner having edge ribs formed along its respective folds and converging to a common corner, also illustrating a side flap fastened in place and cut away at its top to expose the rib. Figure 16 is a fragmentary'vertical sectional view of several cartons formed in accordance with my invention and arranged in stacked relation to shown their relative positions when so stacked. Figure 17 is a view of one corner of a top or bottom closure cover showing the configuration of the slot 2. Figure 18 is a section through one corner of a base assembly including the bottom and the liner, showing the folded flap on the outside. Figure 18a is a similar view of this assembly having the folded flap on the inside. Figure 19 is a view similar to Figure 17, but showing all of the walls stapled together as a unit. Figure 20 is a view in perspective, of a box lid, indicating the direction-of the grain in relation to the finished product and showing the prospective folds.

Referring in detail to the various figures, in Figures 1 and 2, the top and bottom sections are cut in rectangular form, scored as shown at 1 and slotted as shown at 2, being derived from appropriate blanks of solid fibreboard, or similar material, the cutting and slotting being done automatically on rotary presses. The slotting 2 is at right angles to the sides 8. In Figure 3, the inner lining section is similarly cut and scored at 3 from an appropriate blank of solid fibreboard, or the like, and is folded as shown. An extended portion of the board 4 is provided for fastening purposes, the liner being stitched on itself to form a tube of rectangular cross-section.

The top and bottom sections as shown in Figures 1 and 2 are folded in Figures 4 and 5 to provide a closure wall 5, end walls 6 and side walls The flaps 7 which are an extended portion of the end walls 6, are folded and placed in position on the outside of side walls 8 and are staple stitched in position as shown. The extended portion of board 4 shown in Figures 3 and 6 is placed in position on the inside of liner wall 9 and similarly stitched. Figures 4, 5 and 6 also illustrate the stitching 11 in the lid and bottom and stitching 12 in the lining section. Figure 9 illustrates the stitching 11 at the joints of the bottom and inner liner section.

The inner lining section is placed in position within a bottom section with the stitched flap 4 opposite an end wall 6 of the bottom section. Figure 7 shows the box equipped with the inner lining section in assembled form. The plan view here illustrates the top separately and shows the box ready to receive the dynamite, or other product, which it is to contain. The lid is assembled upon the inner lining section in telescoping relationship thereto and in abutting relation to the bottom section of the box. The box in closed form is shown in Figure 8 with an appropriate tape 13 applied in one strip around the perimeter of the box over the seam of abutting covers making the closure of the box complete for shipment. The box of the invention has proved to be highly desirable for shipping dynamite due to its superior strength, the ease with which it may be opened, when desired and the simplicity of its design and construction. Figure 12 is similar to Figure 7 except that the flaps 7 are stitched on the inside of side walls 8.

Basically, the superior strength of my improved box may be attributed to the presence of ribs 21 along the respective edges thereof, and these ribs are formed by scoring two spaced parallel indentations 22 (Figure 13) on the face of the box material, yielding a single wide score which forms rib 21 when the material is folded at approximately 96 about the score. The result of such a fold will automatically cause the material between the double indentations 22 to assume an angle of approximately 45 in relation to either of the two perpendicular portions and thereby create the rib 211 as clearly illustrated in Figure 14.

In Figure 15 I have illustrated three of the ribs 21 converging to a common point to form a reinforced corner and l have further shown a side flap '7 cut away as at 23 so as to expose the adjoining rib clear to the said corner.

Figure 16 illustrates a fragment of a plurality of boxes in stacked relation and showing the weight of each superimposed box resting upon the strengthened rib portion of the box beneath.

In Figures 18 and 18a I have depicted a section through one corner of the base assembly showing the bottom 6, the liner 10, and the flap '7, all stapled together. The flap is outside in Figure 18 and inside in Figure 18a.

In Figure 19, I have shown a section through a top with the liner stitched thereto.

In Figure 20 the direction of the grain is brought out by legends and hatching in relation to the finished prodnot. As may be seen in the cover when assembled, the grain direction of the board in the side panel 8 is vertical; in the end panel 6 it is horizontal and in flap '7 it is horizontal. I have discovered that this arrangement lends increased strength to the completed container, producing a lamination effect at the joints. In addition to preferring that the grain of the board runsthe short way of the blank, I also prefer that the scoring and creasing preparatory to folding shall be across the grain. Thus, the direction of the grain will be different in each layer at the corner, lending increased strength to the joint.

It will be appreciated that the closure involved in my improved box assembly is especially advantageous, in view of the fact that the structure permits the use of tape without any supplementary binding means for joining the top to the bottom. Preferably we use a pressure sensitive paper backed tape, not less than 1 inch. wide. We prefer to use a tape having a backing of about 30 pound stock and a crude rubber adhesive. For instance, the tape may have a caliper thickness of about 5 or 6 mils and the adhesive can be characterized by approximately oz. per square inch of tape on 180 pull on polished metal plate, with about 5% stretch at the break. In general, the basis weight of the rope stock paper should be not less than pounds per ream after sizing and coating. Longitudinal tensile strength should not be less than 50 pounds per inch per width and the latitudinal strength of 11 pounds per inch of width minimum.

The tape should be manufactured of material which will not separate or delarninate when immersed in water for 72 hours and will not show any delamination or bleeding up to F. and which will not lose its strength, delaminate, or become brittle at 0 F.

The tape has many advantages in that it may be peeled off neatly or cleanly without mutilating, and the box can be retaped for shipment in the required manner. The pressure sensitive type of tape offers the best economy on an overall end cost basis. in view of the fact that the bottom of the box and the lining section are staple stitched together in our preferred form, the stress and strain on the tape is minimized and the tape merely holds the lid on instead of holding the box together.

It is to be understood that the invention also includes containers manufactured from corrugated and paper board. The type of board employed, thickness of board, and degree of weatherproofness is governed by the type of product which the box is to contain, and the handling to which the containers are subjected in transportation. The invention is not limited to rectangular containers but includes any convenient shape, for instance, square shaped containers.

Preferably, the grain direction of the board is to run the short way of the sheet, or blank, and the scoring or creasing forming the ribs preferably should run across the grain of the board.

Although I have indicated in the foregoing that my new container is especially adapted for the transportation of explosives, it should be understood that the improved features involved include increased strength, reinforcing ribs, and friction reducing ribbed corners, all rendering the box particularly satisfactory and advantageous for storing, transporting or handling all types of dangerous articles. The friction reducing feature of the rib structure and rib reinforced corners makes the box desirable for universal use for any type of product.

Various changes and modifications may be made with out departing from the scope of the invention.

I claim:

A box assembly comprising an open ended, four-sided, tubular inner lining folded about four parallel, longitudinal, wide-score ribs; a pair of opposing, similar top and bottom closure covers, the peripheral lips of which telescopingly engage said inner liner over its open ends and abut in end-to-end relation near the mid-section of the outside surface of said inner liner; each said closure cover being a folded one-piece blank provided with intersecting pairs of longitudinal and transverse wide-score ribs and four transverse slots superimposed along the end portions of the transverse ribs from the edge of the blank to the closest longitudinal rib; said four transverse slots each having one straight transverse border extending from the edge of the blank to the closest longitudinal rib, a shorter inner border perpendicular to the transverse border at its inner end and disposed along a portion of said closest longitudinal rib, and a second transverse border commencing at the remote end of said inner border and extending at an obtuse angle thereto for at least a portionof its 5 6 length; said tubular inner lining and each of said folded References Cited in the file of this patent closure covers being individually fastened in their respec- UNITED STATES PATENTS tive folded positions by staple stitches; and pressure sensitive tape disposed across the line of abutment of the top 1188401 Bonfield June 1916 and bottom closure covers to hold said covers and the 5 1361564 Gallery 1920 tubular inner lining about which they telescope in assem- 1676872 Schurmann July 1928 bled relation. 1,767,629 Walter June 24, 1930 1,973,930 Rammer Sept. 18, 1934 2,094,783 Belsinger Oct. 5, 1937 10 2,334,902 Buttery Nov. 23, 1943 2,603,406 George July 15, 1952 

